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Segment Information - Summary of Geographical Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of geographical areas [line items] |  |  |
Net sales | kr 247,880 | kr 263,351 | kr 271,546
Non-current assets, total | 87,540 | 100,546 | 138,257
Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 158,207 | 171,442 | 193,468
Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 62,635 | 63,630 | 60,524
Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 24,863 | 25,745 | 14,597
Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 2,175 | 2,534 | 2,957
North America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 72,886 | 59,230 | 95,394
Non-current assets, total | 18,223 | 33,214 | 41,065
North America [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 57,875 | 44,640 | 81,917
North America [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 14,326 | 14,199 | 13,362
North America [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 598 | 266 | 47
North America [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 87 | 125 | 68
Europe and Latin America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 63,410 | 64,884 | 66,790
Non-current assets, total | 66,765 | 64,497 | 93,612
Europe and Latin America [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 40,855 | 42,298 | 44,644
Europe and Latin America [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 22,271 | 22,270 | 21,638
Europe and Latin America [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 284 | 245 | 99
Europe and Latin America [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 0 | 71 | 409
South East Asia, Oceania and India [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 32,410 | 53,318 | 32,951
Non-current assets, total | 1,005 | 886 | 999
South East Asia, Oceania and India [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 23,259 | 43,235 | 23,695
South East Asia, Oceania and India [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 9,114 | 10,038 | 9,179
South East Asia, Oceania and India [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 37 | 36 | 17
South East Asia, Oceania and India [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 0 | 9 | 60
North East Asia [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 18,761 | 23,932 | 26,733
Non-current assets, total | 1,374 | 1,775 | 3,385
North East Asia [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 14,477 | 18,986 | 22,488
North East Asia [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 4,142 | 4,720 | 4,015
North East Asia [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 18 | 37 | 8
North East Asia [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 124 | 189 | 222
Middle East and Africa [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 20,771 | 23,739 | 22,571
Non-current assets, total | 173 | 174 | (804)
Middle East and Africa [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 10,344 | 12,902 | 11,707
Middle East and Africa [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 9,761 | 10,457 | 10,472
Middle East and Africa [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 678 | 378 | 368
Middle East and Africa [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | (12) | 2 | 24
Other regions [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 39,642 | 38,248 | 27,107
Non-current assets, total | 0 | 0 | 0
Other regions [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 11,397 | 9,381 | 9,017
Other regions [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 3,021 | 1,946 | 1,858
Other regions [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 23,248 | 24,783 | 14,058
Other regions [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 1,976 | 2,138 | 2,174
United States [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 98,265 | 85,313 | 109,709
Non-current assets, total | 17,175 | 32,133 | 39,906
European union [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 35,264 | 34,257 | 35,859
Non-current assets, total | 62,126 | 59,456 | 92,167
Sweden [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 2,341 | 1,774 | 3,239
Non-current assets, total | 61,065 | 58,728 | 88,057
India [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 15,194 | 31,205 | 10,957
Non-current assets, total | 569 | 535 | 519
Japan [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 9,072 | 10,139 | 9,965
Non-current assets, total | 199 | 132 | 187
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 10,221 | 10,716 | 10,523
Non-current assets, total | kr 1,007 | kr 1,449 | kr 2,068

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